CHARGE ASSIST SOLENOID KIT,THIS TOOL WAS DESIGNED TO ASSIST IN PROPERLY CHARGING A CHARGE ASSIST EQUIPPED AIR CONDITIONING SYSTEM WITH REFRIGERANT BY INTERFACING WITH MICROPROCESSOR THAT CALCULATES THE SYSTEM SUBCOOLING , DEVICE IS NOT INTENDED TO CHARGE WITHOUT AT LEAST 50 PSIG OF REFRIGERANT PRESSURE OR TEMPERATURE BELOW 65F TO BE USED IN COOLING MODE ONLY, REFRIGERANT: R-22 OR R410A, VOLT:24, LINE SIZE:1/4". KIT INCLUDES: CHARGE ASSIST,HOSE,INSTALLERS GUIDE,WEIGHT:1 LBS 8.9 OZ, IN BOX, MADE IN USA.**(ALT # 53777)**